When I was 2 years old, I still slept in my crib, I remember the house we lived in, and I remember the monster under the bed. This is the deal, your daughter doesn't have to watch t.v. to have monsters under her bed.
We didn't have a t.v. when we lived out on the farm, and I still managed to make one up.
Don't try to tell her it isn't there, because she believes it is...that only makes her realise you can't see it and that will make her even more scared because you can't help her if you don't see it.
What worked for me, is my mother got an empty spray bottle and put "monsterspray" in it. She would go and spray the room, and under the bed, in the closet, and say, "There, they hate monsterspray! They can't come in here now."
It worked, and eventually the monsters went away.
If your child is bright and verbal, her imagination is alive and well, and working overtime at night.
Ps. I played under the crib, during the daytime and knew the monsters were only there at night. So if she's scared to be in the room during the day too, you might need to monsterspray during the day too.